Question

below are four models of different compounds. if nitrogen atoms are larger than hydrogen atoms, which of the models best represents ammonia (nh₃)?

Explanation:

Ammonia ($NH_3$) has one nitrogen atom and three hydrogen atoms. Option b has one larger atom (nitrogen) and three smaller atoms (hydrogen), which matches the formula $NH_3$. Option a has only two atoms, option c has one larger and four smaller atoms, and option d's structure is not in line with the typical trigonal - pyramidal (approximate planar - triangular in simple ball - and - stick for basic counting) structure of $NH_3$ when just counting atoms (it has one larger and three smaller atoms but the bond angles and overall shape representation in a simple model for atom - counting purposes, option b is more in line with the 1:3 atom ratio).

Answer:

B.